Henry Oliver "Hank" Hansen (December 14, 1919 – March 1, 1945) was a United States Marine Corps sergeant who was killed in action during the Battle of Iwo Jima in World War II. He was member of the combat patrol that climbed, captured, and raised the American flag and flagstaff on top of Mount Suribachi on February 23, 1945. He helped to raise the first flag, and was for a time, incorrectly identified as being one of the six flag raisers in the world famous second Mount Suribachi flag raising photograph taken the same day by Associated Press photographer, Joe Rosenthal.

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He joined the Marines at age 18 and trained as a Paramarine. The Paramarines disbanded in February 1944 and he was transferred to the 2nd Battalion, 28th Marines, 5th Marine Division.